2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Entry point to the representation of procedure code.
23 * @author Martin Trapp, Christian Schaefer, Goetz Lindenmaier
26 #ifndef FIRM_IR_IRGRAPH_H
27 #define FIRM_IR_IRGRAPH_H
31 #include "firm_types.h"
34 * @page ir_graph The struct ir_graph
36 * This struct contains all information about a procedure.
37 * It's allocated directly to memory.
39 * The fields of ir_graph:
41 * - ent The entity describing this procedure.
43 * The beginning and end of a graph:
45 * - start_block This ir_node is the block that contains the unique
46 * start node of the procedure. With it it contains
47 * the Proj's on starts results.
48 * Further all Const nodes are placed in the start block.
49 * - start This ir_node is the unique start node of the procedure.
51 * - end_block This ir_node is the block that contains the unique
52 * end node of the procedure. This block contains no
54 * - end This ir_node is the unique end node of the procedure.
56 * The following nodes are Projs from the Start node, held in ir_graph for
59 * - frame The ir_node producing the pointer to the stack frame of
60 * the procedure as output. This is the Proj node on the
61 * third output of the start node. This output of the start
62 * node is tagged as pns_frame_base. In FIRM most local
63 * variables are modeled as data flow edges. Static
64 * allocated arrays can not be represented as data flow
65 * edges. Therefore FIRM has to represent them in the stack
68 * - globals This models a pointer to a space in the memory where
69 * _all_ global things are held. Select from this pointer
70 * with a Sel node the pointer to a global variable /
71 * procedure / compiler known function... .
73 * - tls This models a pointer to a space in the memory where
74 * thread local things are held. Select from this pointer
75 * with a Sel node the pointer to a thread local variable.
77 * - args The ir_node that produces the arguments of the method as
78 * it's result. This is a Proj node on the fourth output of
79 * the start node. This output is tagged as pn_Start_T_args.
81 * - proj_args The proj nodes of the args node.
83 * - bad The Bad node is an auxiliary node. It is needed only once,
84 * so there is this globally reachable node.
86 * - no_mem The NoMem node is an auxiliary node. It is needed only once,
87 * so there is this globally reachable node.
89 * Data structures that are private to a graph:
91 * - obst An obstack that contains all nodes.
93 * - current_block A pointer to the current block. Any node created with
94 * one of the node constructors (new_<opcode>) are assigned
95 * to this block. It can be set with set_cur_block(block).
96 * Only needed for ir construction.
98 * - params/n_loc An int giving the number of local variables in this
99 * procedure. This is needed for ir construction. Name will
102 * - value_table This hash table (pset) is used for global value numbering
103 * for optimizing use in iropt.c.
105 * - Phi_in_stack; a stack needed for automatic Phi construction, needed only
106 * during ir construction.
108 * - visited A int used as flag to traverse the ir_graph.
110 * - block_visited A int used as a flag to traverse block nodes in the graph.
113 /** Global variable holding the current ir graph.
115 * This global variable is used by the ir construction
116 * interface in ircons and by the optimizations.
117 * Further it is set by all walker functions.
119 extern ir_graph *current_ir_graph;
121 ir_graph *get_current_ir_graph(void);
122 void set_current_ir_graph(ir_graph *graph);
124 #ifdef INTERPROCEDURAL_VIEW
125 /** This flag indicate the current view. The behavior of some methods
126 * (get_irn_*, set_irn_*) is influenced by this flag. */
127 int get_interprocedural_view(void);
128 void set_interprocedural_view(int state);
132 * Create a new ir graph to build ir for a procedure.
134 * @param ent A pointer to an entity representing the procedure,
135 * i.e., the type of the entity must be of a method type.
137 * @param n_loc The number of local variables in this procedure including
138 * the procedure parameters.
140 * This constructor generates the basic infrastructure needed to
141 * represent a procedure in FIRM.
143 * It allocates an ir_graph and sets the field irg of the entity ent
144 * as well as current_ir_graph to point to this graph.
145 * Further it allocates the following nodes needed for every
148 * - The start block containing a start node and Proj nodes for it's
149 * seven results (X, M, P, P, P, T, P).
150 * - The end block containing an end node. This block is not matured
151 * after executing new_ir_graph() as predecessors need to be added to it.
152 * (Maturing a block means fixing it's number of predecessors.)
153 * - The current block, which is empty and also not matured.
155 * Further it enters the global store into the data structure of the start
156 * block that contains all valid values in this block (set_store()). This
157 * data structure is used to build the Phi nodes and removed after
158 * completion of the graph. There is no path from end to start in the
159 * graph after calling ir_graph.
161 * The op_pin_state of the graph is set to "op_pin_state_pinned"
162 * if no global cse was performed on the graph.
163 * It is set to "op_pin_state_floats" if global cse was performed
164 * (and during construction: did actually change something).
165 * Code placement is necessary.
167 * @see new_pseudo_ir_graph()
169 ir_graph *new_ir_graph(ir_entity *ent, int n_loc);
171 /** Frees the passed irgraph.
172 * Deallocates all nodes in this graph and the ir_graph structure.
173 * Sets the field irgraph in the corresponding entity to NULL.
174 * Does not remove the irgraph from the list in irprog (requires
175 * inefficient search, call remove_irp_irg by hand).
176 * Does not free types, entities or modes that are used only by this
177 * graph, nor the entity standing for this graph.
179 void free_ir_graph(ir_graph *irg);
181 /* --- access routines for all ir_graph attributes --- */
184 * Checks whether a pointer points to a ir graph.
186 * @param thing an arbitrary pointer
189 * true if the thing is a IR graph, else false
191 int is_ir_graph(const void *thing);
193 /** Returns the entity of an IR graph. */
194 ir_entity *get_irg_entity(const ir_graph *irg);
195 /** Sets the entity of an IR graph. */
196 void set_irg_entity(ir_graph *irg, ir_entity *ent);
198 /** Returns the frame type of an IR graph. */
199 ir_type *get_irg_frame_type(ir_graph *irg);
200 /** Sets the frame type of an IR graph. */
201 void set_irg_frame_type(ir_graph *irg, ir_type *ftp);
203 /** Returns the value parameter type of an IR graph. */
204 ir_type *get_irg_value_param_type(ir_graph *irg);
206 /** Returns the start block of an IR graph. */
207 ir_node *get_irg_start_block(const ir_graph *irg);
208 /** Sets the start block of an IR graph. */
209 void set_irg_start_block(ir_graph *irg, ir_node *node);
211 /** Returns the Start node of an IR graph. */
212 ir_node *get_irg_start(const ir_graph *irg);
213 /** Sets the Start node of an IR graph. */
214 void set_irg_start(ir_graph *irg, ir_node *node);
216 /** Returns the end block of an IR graph. */
217 ir_node *get_irg_end_block(const ir_graph *irg);
218 /** Sets the end block of an IR graph. */
219 void set_irg_end_block(ir_graph *irg, ir_node *node);
221 /** Returns the End node of an IR graph. */
222 ir_node *get_irg_end(const ir_graph *irg);
223 /** Sets the End node of an IR graph. */
224 void set_irg_end(ir_graph *irg, ir_node *node);
226 /* The fields end_reg and end_except contain the end nodes of the
227 interprocedural view. If the view is not constructed they contain
228 the normal end node. */
229 ir_node *get_irg_end_reg(const ir_graph *irg);
230 void set_irg_end_reg(ir_graph *irg, ir_node *node);
232 ir_node *get_irg_end_except(const ir_graph *irg);
233 void set_irg_end_except(ir_graph *irg, ir_node *node);
235 /** Returns the node that represents the initial control flow of the given IR graph. */
236 ir_node *get_irg_initial_exec(const ir_graph *irg);
237 /** Sets the node that represents the initial control of the given IR graph. */
238 void set_irg_initial_exec(ir_graph *irg, ir_node *node);
240 /** Returns the node that represents the frame pointer of the given IR graph. */
241 ir_node *get_irg_frame(const ir_graph *irg);
242 /** Sets the node that represents the frame pointer of the given IR graph. */
243 void set_irg_frame(ir_graph *irg, ir_node *node);
245 /** Returns the node that represents the tls pointer of the given IR graph. */
246 ir_node *get_irg_tls(const ir_graph *irg);
247 /** Sets the node that represents the tls pointer of the given IR graph. */
248 void set_irg_tls(ir_graph *irg, ir_node *node);
250 /** Returns the node that represents the initial memory of the given IR graph. */
251 ir_node *get_irg_initial_mem(const ir_graph *irg);
252 /** Sets the node that represents the initial memory of the given IR graph. */
253 void set_irg_initial_mem(ir_graph *irg, ir_node *node);
255 /** Returns the node that represents the argument pointer of the given IR graph. */
256 ir_node *get_irg_args(const ir_graph *irg);
257 /** Sets the node that represents the argument pointer of the given IR graph. */
258 void set_irg_args(ir_graph *irg, ir_node *node);
260 /** Returns the current block of an IR graph. */
261 ir_node *get_irg_current_block(const ir_graph *irg);
262 /** Sets the current block of an IR graph. */
263 void set_irg_current_block(ir_graph *irg, ir_node *node);
265 /** Returns the Bad node of the given IR graph. Use new_Bad() instead!! */
266 ir_node *get_irg_bad(const ir_graph *irg);
267 void set_irg_bad(ir_graph *irg, ir_node *node);
269 /** Returns the NoMem node of the given IR graph. Use new_NoMem() instead!! */
270 ir_node *get_irg_no_mem(const ir_graph *irg);
271 void set_irg_no_mem(ir_graph *irg, ir_node *node);
273 /** Returns the number of value numbers of an IR graph. */
274 int get_irg_n_locs(ir_graph *irg);
276 /** Returns the graph number. */
277 long get_irg_graph_nr(const ir_graph *irg);
280 * Returns the graph number. This is a unique number for the graph and is
281 * smaller than get_irp_last_idx()
282 * Note: you cannot use this number for get_irp_irg()
284 int get_irg_idx(const ir_graph *irg);
287 * Get the node for an index.
288 * @param irg The graph.
289 * @param idx The index you want the node for.
290 * @return The node with that index or NULL, if there is no node with that index.
291 * @note The node you got might be dead.
293 ir_node *get_idx_irn(ir_graph *irg, unsigned idx);
296 /********************************************************************************/
297 /* States of an ir_graph. */
298 /********************************************************************************/
301 information associated with the graph. Optimizations invalidate these
304 /** The states of an ir graph.
306 * state phase values: phase_building, phase_high, phase_low, phase_backend.
308 * The graph is in phase_building during construction of the irgraph.
309 * The construction is finished by a call to finalize_cons().
311 * Finalize_cons() sets the state to phase_high. All standard Firm nodes are
314 * To get the irgraph into phase_low all Sel nodes must be removed and
315 * replaced by explicit address computations. SymConst size and
316 * type tag nodes must be removed (@@@ really?). Initialization of
317 * memory allocated by Alloc must be explicit. @@@ More conditions?
319 * phase_backend is set if architecture specific machine nodes are inserted
320 * (and probably most standard Firm are removed).
323 phase_building, /**< The graph is still being constructed. */
324 phase_high, /**< The construction of the graph is finish, high level nodes may be present. */
325 phase_low, /**< High level nodes are removed. */
326 phase_backend /**< The graph is taken by the backend. Machine specific nodes may be present. */
329 /** Returns the phase_state of an IR graph. */
330 irg_phase_state get_irg_phase_state(const ir_graph *irg);
332 /** Sets the phase state of an IR graph. */
333 void set_irg_phase_state(ir_graph *irg, irg_phase_state state);
335 /** Sets the phase of the given IR graph to low. */
336 #define set_irg_phase_low(irg) set_irg_phase_state(irg, phase_low)
338 /** state: op_pin_state_pinned
339 The graph is "op_pin_state_pinned" if all nodes are associated with a basic block.
340 It is in state "op_pin_state_floats" if nodes are in arbitrary blocks. In state
341 "op_pin_state_floats" the block predecessor is set in all nodes, but this can be an
342 invalid block, i.e., the block is not a dominator of all the uses of
344 The enum op_pin_state is defined in irop.h. */
345 op_pin_state get_irg_pinned(const ir_graph *irg);
347 /** state: outs_state
348 * Outs are the back edges or def-use edges of ir nodes.
349 * Values: outs_none, outs_consistent, outs_inconsistent */
351 outs_none, /**< Outs are not computed, no memory is allocated. */
352 outs_consistent, /**< Outs are computed and correct. */
353 outs_inconsistent /**< Outs have been computed, memory is still allocated,
354 but the graph has been changed since. */
356 irg_outs_state get_irg_outs_state(const ir_graph *irg);
357 void set_irg_outs_inconsistent(ir_graph *irg);
359 /** state: extended basic block state. */
361 extblk_none = 0, /**< No extended basic block information is constructed. Default. */
362 extblk_valid = 1, /**< Extended basic block information is valid. */
363 extblk_invalid = 2 /**< Extended basic block information is constructed but invalid. */
365 irg_extblk_state get_irg_extblk_state(const ir_graph *irg);
366 void set_irg_extblk_inconsistent(ir_graph *irg);
369 * Signals the state of the dominator / post dominator information.
372 dom_none, /**< dominator are not computed, no memory is allocated */
373 dom_consistent, /**< dominator information is computed and correct */
374 dom_inconsistent /**< dominator information is computed but the graph has been changed since */
377 /** returns the dominator state of an IR graph. */
378 irg_dom_state get_irg_dom_state(const ir_graph *irg);
380 /** returns the post dominator state of an IR graph. */
381 irg_dom_state get_irg_postdom_state(const ir_graph *irg);
383 /** sets the dominator and post dominator state of an IR graph to inconsistent. */
384 void set_irg_doms_inconsistent(ir_graph *irg);
386 /** state: loopinfo_state
387 * Loop information describes the loops within the control and
388 * data flow of the procedure.
391 loopinfo_none = 0, /**< No loop information is constructed. Default. */
392 loopinfo_constructed = 1, /**< Some kind of loop information is constructed. */
393 loopinfo_valid = 2, /**< Loop information is valid. */
394 loopinfo_cf = 4, /**< Loop information constructed for control flow only. */
395 loopinfo_inter = 8, /**< Loop information for interprocedural view. */
397 /** IntRAprocedural loop information constructed and valid. */
398 loopinfo_consistent = loopinfo_constructed | loopinfo_valid,
399 /** IntRAprocedural loop information constructed and invalid. */
400 loopinfo_inconsistent = loopinfo_constructed,
402 /** IntERprocedural loop information constructed and valid. */
403 loopinfo_ip_consistent = loopinfo_constructed | loopinfo_inter | loopinfo_valid,
404 /** IntERprocedural loop information constructed and invalid. */
405 loopinfo_ip_inconsistent = loopinfo_constructed | loopinfo_inter,
407 /** IntRAprocedural control loop information constructed and valid. */
408 loopinfo_cf_consistent = loopinfo_constructed | loopinfo_cf | loopinfo_valid,
409 /** IntRAprocedural control loop information constructed and invalid. */
410 loopinfo_cf_inconsistent = loopinfo_constructed | loopinfo_cf,
412 /** IntERprocedural control loop information constructed and valid. */
413 loopinfo_cf_ip_consistent = loopinfo_constructed | loopinfo_cf | loopinfo_inter | loopinfo_valid,
414 /** IntERprocedural control loop information constructed and invalid. */
415 loopinfo_cf_ip_inconsistent = loopinfo_constructed | loopinfo_cf | loopinfo_inter
416 } irg_loopinfo_state;
418 /** Return the current loop information state. */
419 irg_loopinfo_state get_irg_loopinfo_state(const ir_graph *irg);
421 /** Sets the current loop information state. */
422 void set_irg_loopinfo_state(ir_graph *irg, irg_loopinfo_state s);
424 /** Sets the loop information state to the appropriate inconsistent state.
425 * If state is 'none' does not change. */
426 void set_irg_loopinfo_inconsistent(ir_graph *irg);
427 /** Sets the loop information state to the appropriate inconsistent state.
428 * If state is 'none' does not change.
429 * Does this for all irgs. */
430 void set_irp_loopinfo_inconsistent(void);
432 /** state: callee_information_state
433 * Call nodes contain a list of possible callees. This list must be
434 * computed by an analysis.
436 * It's strange that this state is administered on irg basis, as the
437 * information must be computed for the whole program, or not?
440 irg_callee_info_none,
441 irg_callee_info_consistent,
442 irg_callee_info_inconsistent
443 } irg_callee_info_state;
445 /** Returns the callee_info_state of an IR graph. */
446 irg_callee_info_state get_irg_callee_info_state(const ir_graph *irg);
448 /** Sets the callee_info_state of an IR graph. */
449 void set_irg_callee_info_state(ir_graph *irg, irg_callee_info_state s);
452 * Tells how to handle an ir graph in inlining.
455 irg_inline_any, /**< No restriction on inlining. Default. */
456 irg_inline_forbidden, /**< The graph must not be inlined. */
457 irg_inline_recomended, /**< The graph should be inlined. */
458 irg_inline_forced, /**< The graph must be inlined. */
459 irg_inline_forced_no_body /**< The graph must be inlined. No body is allowed
461 } irg_inline_property;
463 /** Returns the inline property of a graph. */
464 irg_inline_property get_irg_inline_property(const ir_graph *irg);
465 /** Sets the inline property of a graph. */
466 void set_irg_inline_property(ir_graph *irg, irg_inline_property s);
469 * Returns the mask of the additional graph properties.
470 * The properties are automatically inherited from the method type
471 * if they were not set using set_irg_additional_properties() or
472 * set_irg_additional_property().
474 * @return a bitset of mtp_additional_property values
476 unsigned get_irg_additional_properties(const ir_graph *irg);
478 /** Sets the mask of the additional graph properties. */
479 void set_irg_additional_properties(ir_graph *irg, unsigned property_mask);
481 /** Sets one additional graph property. */
482 void set_irg_additional_property(ir_graph *irg, mtp_additional_property flag);
484 /** A void * field to link arbitrary information to the node. */
485 void set_irg_link (ir_graph *irg, void *thing);
486 void *get_irg_link (const ir_graph *irg);
488 /** Increments visited flag by one.
489 * @see also: get_irn_visited() get_irg_block_visited(). */
490 void inc_irg_visited(ir_graph *irg);
491 ir_visited_t get_irg_visited(const ir_graph *irg);
492 void set_irg_visited(ir_graph *irg, ir_visited_t i);
493 /** An interprocedural flag valid for all irgs.
494 * @see also: get_irn_visited() get_irg_block_visited(). */
495 ir_visited_t get_max_irg_visited(void);
496 void set_max_irg_visited(int val);
497 ir_visited_t inc_max_irg_visited(void);
499 /** Increments block_visited by one.
500 * @see also: get_irn_visited() get_irg_block_visited(). */
501 void inc_irg_block_visited(ir_graph *irg);
502 ir_visited_t get_irg_block_visited(const ir_graph *irg);
503 void set_irg_block_visited(ir_graph *irg, ir_visited_t i);
506 * Debug helpers: You can indicate whether you are currently using visited or
507 * block_visited flags. If NDEBUG is not defined, then the compiler will abort
508 * if 2 parties try to use the flags.
510 enum ir_resources_enum_t {
511 /* local (irg) resources */
512 IR_RESOURCE_BLOCK_VISITED = 1 << 0, /**< Block visited flags are used. */
513 IR_RESOURCE_BLOCK_MARK = 1 << 1, /**< Block mark bits are used. */
514 IR_RESOURCE_IRN_VISITED = 1 << 2, /**< IR-node visited flags are used. */
515 IR_RESOURCE_IRN_LINK = 1 << 3, /**< IR-node link fields are used. */
516 IR_RESOURCE_LOOP_LINK = 1 << 4, /**< IR-loop link fields are used. */
517 IR_RESOURCE_PHI_LIST = 1 << 5, /**< Block Phi lists are used. */
518 IR_RESOURCE_IRG_LINK = 1 << 6, /**< IR-graph link fields used. */
520 /* global (irp) resources */
521 IR_RESOURCE_ENTITY_LINK = 1 << 8, /**< IR-entity link fields are used. */
522 IR_RESOURCE_TYPE_VISITED = 1 << 9, /**< type visited flags */
525 IR_RESOURCE_LOCAL_MASK = 0x00FF, /**< Mask for all local resources. */
526 IR_RESOURCE_GLOBAL_MASK = 0xFF00 /**< Mask for all global resources. */
528 typedef unsigned ir_resources_t;
531 void ir_reserve_resources(ir_graph *irg, ir_resources_t resources);
532 void ir_free_resources(ir_graph *irg, ir_resources_t resources);
533 ir_resources_t ir_resources_reserved(const ir_graph *irg);
535 #define ir_reserve_resources(irg,resources) (void)0
536 #define ir_free_resources(irg,resources) (void)0
537 #define ir_resources_reserved(irg) 0
544 IR_GRAPH_STATE_KEEP_MUX = 1 << 0, /**< should perform no further optimisations on Mux nodes */
545 IR_GRAPH_STATE_ARCH_DEP = 1 << 1, /**< should not construct more nodes which irarch potentially breaks down */
548 /** set some state flags on the graph (this does not clear the other flags) */
549 void set_irg_state(ir_graph *irg, ir_graph_state_t state);
550 /** clear some state flags of the graph */
551 void clear_irg_state(ir_graph *irg, ir_graph_state_t state);
552 /** query wether a set of graph state flags are activated */
553 int is_irg_state(const ir_graph *irg, ir_graph_state_t state);
555 /** Normalization: Move Proj nodes into the same block as its predecessors */
556 void normalize_proj_nodes(ir_graph *irg);
558 /** Set a description for local value n. */
559 void set_irg_loc_description(ir_graph *irg, int n, void *description);
561 /** Get the description for local value n. */
562 void *get_irg_loc_description(ir_graph *irg, int n);
564 /** Returns a estimated node count of the irg. This count is updated
565 * after every irg_walk_graph().
567 unsigned get_irg_estimated_node_cnt(const ir_graph *irg);
569 /** Returns the last irn index for this graph. */
570 unsigned get_irg_last_idx(const ir_graph *irg);
572 /** Returns the floating point model of this graph. */
573 unsigned get_irg_fp_model(const ir_graph *irg);
575 /** Sets a floating point model for this graph. */
576 void set_irg_fp_model(ir_graph *irg, unsigned model);
579 * Access custom graph data.
580 * The data must have been registered with
581 * register_additional_graph_data() before.
582 * @param graph The graph to get the data from.
583 * @param type The type of the data you registered.
584 * @param off The value returned by register_additional_graph_data().
585 * @return A pointer of type @p type.
587 #define get_irg_data(graph,type,off) \
588 (assert(off > 0 && "Invalid graph data offset"), (type *) ((char *) (graph) - (off)))
591 * Get the pointer to the node some custom data belongs to.
592 * @param data The pointer to the custom data.
593 * @param off The number as returned by register_additional_graph_data().
594 * @return A pointer to the ir node the custom data belongs to.
596 #define get_irg_data_base(data,off) \
597 (assert(off > 0 && "Invalid graph data offset"), (ir_graph *) ((char *) (data) + (off)))
600 * Request additional data to be allocated with an ir graph.
601 * @param size The size of the additional data required.
602 * @return A positive number, if the operation was successful, which
603 * must be passed to the access macro get_irg_data(), 0 if the
604 * registration failed.
606 size_t register_additional_graph_data(size_t size);